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Circuit examples

Application Guide TwinSAFE 13

2.2 ESTOP function variant 2 (Category 3, PL d)

The emergency stop button is connected via two break contacts to an EL1904 safe input terminal. The

testing of the two signals is activated. The signals are not tested for discrepancy. The restart and the

feedback signal are wired to standard terminals and are transferred to TwinSAFE via the standard PLC.

The contactors K1 and K2 are connected in parallel to the safe output. Current measurement and testing

of the output are active for this circuit.

2.2.1 Parameters of the safe input and output terminals

EL1904

Parameter Value

Sensor test channel 1 active Yes

Sensor test channel 2 active Yes

Sensor test channel 3 active Yes

Sensor test channel 4 active Yes

Logic channel 1 and 2 Single Logic

Logic channel 3 and 4 Single Logic

EL2904

Parameter Value

Current measurement active Yes

Output test pulses active Yes

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 139 140

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